Different length scales for order parameters in two-gap superconductors: Extended Ginzburg-Landau theory

L. Komendová; M. V. Milošević; A. A. Shanenko; F. M. Peeters

doi:10.1103/PhysRevB.84.064522

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Different length scales for order parameters in two-gap superconductors: Extended Ginzburg-Landau theory

L. Komendová, M. V. Milošević, A. A. Shanenko, F. M. Peeters

DOI 10.1103/PhysRevB.84.064522 · Physical Review B

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Abstract

Using the Ginzburg-Landau theory extended to the next-to-leading order, we determine numerically the healing lengths of the two order parameters at the two-gap superconductor/normal metal interface. We demonstrate on several examples that those can be different even in the strict domain of applicability of the Ginzburg-Landau theory. This justifies the use of this theory to describe relevant physics of two-gap superconductors, distinguishing them from their single-gap counterparts. The calculational degree of complexity increases only slightly with respect to the conventional Ginzburg-Landau expansion, thus the extended Ginzburg-Landau model remains numerically far less demanding compared to the full microscopic approaches.

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Formula	Reported Tc (K)	Pressure (GPa)	Type
MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
LiFeAs Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown